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Across 1. The major artery that leaves the left side of the heart carrying oxygenated blood to the body tissues 4. Red coloured liquid which carries the substances around the body 6. Structure that separates the two upper chambers and two lower of the heart 7. Chest pain or discomfort caused when your heart muscle doesn't get enough oxygen-rich blood 8. Tiny blood vessels that are close to the body’s cells where exchanges can happen 10. Number of times your heart beats per minute 12. A muscular pump that keeps the blood moving around the body 13. The major blood vessel returning to the left side of the heart from the lungs, carrying oxygenated blood

Down 1. Degeneration of the walls of the arteries caused by accumulated fatty deposits and scar tissue, and leading to restriction of the circulation and a risk of thrombosis 2. The artery carrying blood from the right ventricle of the heart to the lungs for oxygenation. 3. A surgical procedure to restore normal blood flow to an obstructed coronary artery. 5. Blood vessel which return blood to the heart 7. Blood vessel which carries blood away from the heart 9. Strings which connect the heart muscles to the tricuspid valve and the mitral valve in the heart. 11. Structure containing a flap or flaps to ensure one-way flow of liquid